[EVDL] scooter 72 volt battery packs

[ken via EV]

some ev scooter manufactores are selling  72V33AH  SAMSUNG 22P SDI lithium
battery.
http://www.samsungsdi.com/lithium-ion-battery/e-scooter

The capacity of lead-acid batteries is about 50% of the initial capacity
after 1.5 years of use (about 400 cycles), but that of Li-ion batteries is
about 75% of the initial capacity after 3 years of use (about 800 cycles).
As the minimum required life for an E-scooter is three years,..


Whats so important about this??.. when LFP gos for  2000 cycles aat 80%.

is it cost? 800 cycles would be about 2-3 years driving and LFP much more...

___
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Read EVAngel's EV News at http://evdl.org/evln/
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)

Re: [EVDL] scooter 72 volt battery packs

[Michael Ross via EV]

I doubt you can make a valid comparison.  All LFP are not created equal,
all life tests are not created equal, all management systems are not
equal.  You probably can't get good answers about the test conditions no
matter how hard you try.  It is true that you can draw more capacity from a
Li ion pack.  The Samsung cells are not LFP.  They charge to a higher
voltage.   LFP deteriorates at lower temps when fully charged.  Lead acid
are forgiving of overcharging events. Li ion are not.

My guess is the Samsung cells could equal the cycle life of LFP cells if
managed well.  If Li ion cells fail early they cost a lot more compared to
lead acid, so you better get the management right.
On Dec 30, 2015 2:09 AM, "ken via EV"  wrote:

> some ev scooter manufactores are selling  72V33AH  SAMSUNG 22P SDI lithium
> battery.
> http://www.samsungsdi.com/lithium-ion-battery/e-scooter
>
> The capacity of lead-acid batteries is about 50% of the initial capacity
> after 1.5 years of use (about 400 cycles), but that of Li-ion batteries is
> about 75% of the initial capacity after 3 years of use (about 800 cycles).
> As the minimum required life for an E-scooter is three years,..
>
>
> Whats so important about this??.. when LFP gos for  2000 cycles aat 80%.
>
> is it cost? 800 cycles would be about 2-3 years driving and LFP much
> more...
>
> ___
> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> http://lists.evdl.org/listinfo.cgi/ev-evdl.org
> Read EVAngel's EV News at http://evdl.org/evln/
> Please discuss EV drag racing at NEDRA (
> http://groups.yahoo.com/group/NEDRA)
>
>
-- next part --
An HTML attachment was scrubbed...
URL: 

___
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Read EVAngel's EV News at http://evdl.org/evln/
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)